George a



G. A. TOWNSEND.

Damper.

Patented Aug. 13, 1867.

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GEORGE A. TOWNSEND, OF, HORNELLSVILLE, NEW YORK.

Letters Patent No. 67,687, dated August 13, 1867.

AUTOMATIC DAMPERS.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, GEORGE A. TOWNSEND, of the town of Hornellsville, in the county of Steuben, in the State of New York, have invented certain new and useful improvements in run Automatic Damper for stove pipes, operated by the expansion of metals in the pipe; and the following is a full, clear, and exact description of the same, referenc e being had to the accompanying drawings, making a part of this specification, in

which- Fi'gure 1 represents a vertical edge-view section, showing the damper closed.

Figure 2 shows a flat-view section of the same with the damper opened.

lhe object of my invention is to regulate the draught of a stove automatically-by its own heat. operating in the first or second joint of the pipe. 1

My invention consists in the arrangement of one or more strips or bars of expansive metal, in combination with a compound lever, connected with a plate-damper placed in the centre of the first or second joint of a stove pipe, so hinged that the slightest elongation or the contraction will move the plate, to close or open the area of the passage for the air to pass, thus producing more or less draught, the area of the passage being indicatedby a linger on the outer surface of the pipe, and, if desirable, the plate-damper can be held in a fixed position by a thumb-nut on the outer end of the shaft. v

To enable others to make and use my invention, I will describe it more fully, referring to the drawings and to the letters marked thereon.

In the centre of the stove pipe A I extend longitudinally a flat bar or strip of metal, B, the bottom end being fastened at a tight angle to another bar, C, which is fixed in a stationary position to the pipe A, the top end of the bar or strip B being also fastened to a round rod, D, which is at right angles and rests in holes or notches in the upper end of the/pipe A. On the round rod D the plate-damper E is hung on ears e a, so as to turn easily on the rod. To the central portion of the plate E is hinged a narrow, flat lever, a, which is pivoted to another similar lever or strip of flat metal, b, which is pivoted to the flat vertical bar B, so as to have a short fulcrum, d, to be acted on by the more expansive strips of metal F f, which may be one or more in number, as will best efl'ect the purpose. The expansive metal strips F may be firmly riveted to the standard or strip B at the ba's C, so that the elongation will all be in one direction to operate on the fulcrum of the lever a to close the damper E as the metal expands, and also to open it"as the strips Ffcontrnct. On one end of the rod D, which projects through the pipe A, I have a finger or pointer, IL, connected-with the plate-damper E, so that the position of the damper will always be shown on the outside, and its movements indicated as the expansion or contraction is going on. If at any time it should be desirable to hold the damper in a fixed position, either closed or open, I have provided a thumb-nut, a, on the rod D, so as to tighten up against the finger or pointer 7t, and hold the damper by its friction. If the strips expand while the plate is secured, they will bend and bow away from the standard 13 enough to compensate'for their elongation.

Thus it will be seen that a very complete self-acting damper can ,be made to regulate the draught of stoves, and applied in a cheap and neat manner.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

The expansive strip or bars of metal F f, placed in or near the centre of the first or-second joint of the stove pipe, when combined with the levers a and b, plate-damper E, constructed and operating in the manner substantially as and for the purposes set forth.

I claim the thumb-nut i, pointer h, in combination with the plate-damper E, compound levers'a b, and expansiveibars Ff, as herein described, for the purposes specified.

In testimony whereof I subscribe my name on this 18th day of March, 1867.

' GEORGE A. TOWNSEND.

Witnesses:

A. B. Hnnnnnsno'rr, Hermon Monsn. 

